<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>

        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>

        <!--按钮区-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>

      </el-form>



    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        //这是登录表单的数据绑定对象
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        //这是表单的验证规则
        loginFormRules: {
          //验证用户名是否合法
          username: [{
              required: true,
              message: '请输入登陆名',
              trigger: 'blur'
            },
            {
              min: 3,
              max: 10,
              message: '长度在 3 到 10 个字符',
              trigger: 'blur'
            }
          ],
          //验证密码是否合法
          password: [{
              required: true,
              message: '请输入登陆密码',
              trigger: 'blur'
            },
            {
              min: 6,
              max: 15,
              message: '长度在6到 10 个字符',
              trigger: 'blur'
            }
          ]
        }
      }
    },
    methods: {
      resetLoginForm() {
        this.$refs.loginFormRef.resetFields()
      },
      login() {
        //在调用login时，我们先拿到表单的引用，然后调用表单验证validate函数,
        this.$refs.loginFormRef.validate(async valid => {
          // console.log(valid)
          //通过valid值可以判断出是否通过预验证
          //通过预验证结果来判断是否发起登陆请求
          if (!valid) return
          const {data:res} = await this.$http.post('login', this.loginForm)
          if(res.meta.status!==200) return this.$message.error('登陆失败')
          this.$message.success('登陆成功')

          //将登陆成功之后的token保存到sessionstorage中
          window.sessionStorage.setItem('token',res.data.token)

          //通过编程式导航跳转到后台主页，路由地址是/home
           this.$router.push('/home')
        })
      }
    }
  };
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 50%;
    height: 60%;
    background-color: #fff;
    border-radius: 4px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }

    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 30px;
      box-sizing: border-box;

      .btns {
        display: flex;
        justify-content: flex-end;
      }
    }
  }
</style>
